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63 lines
1.7 KiB
Markdown
63 lines
1.7 KiB
Markdown
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# Assembling binaries
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For a system to be able to self-reproduce, it needs to assemble source z80
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assembly to binary.
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## Goals
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Have a RC2014 assemble a Collapse OS kernel with its source living on a CFS on
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a SD card.
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**Work in progress: for now, we compile a simple hello.asm source file.**
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## Gathering parts
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* Same parts as the [SD card recipe](../sdcard).
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## The zasm binary
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To achieve our goal in this recipe, we'll need a zasm binary on the SD card.
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This zasm binary needs to be compiled with the right jump offsets for the kernel
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we build in this recipe. These offsets are in `user.h` and are closely in sync
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with the configuration in `glue.asm`.
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`user.h` is then included in `apps/zasm/glue.asm`.
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The makefile in this recipe takes care of compiling zasm with the proper
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`user.h` file and place it in `cfsin/zasm`
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## The userland source
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The code we're going to compile is `cfsin/hello.asm`. As you can see, we also
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include `user.h` in this source code or else `ld hl, sAwesome` would load the
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wrong offset.
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Because of this, the Makefile takes care of copying `user.h` in our filesystem.
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## Preparing the card and kernel
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After running `make`, you'll end up with `sdcard.cfs` which you can load the
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same way you did in the SD card recipe.
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You will also have `os.bin`, which you can flash on your EEPROM the same way
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you already did before.
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## Running it
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Compiling and running `hello.asm` is done very much like in
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[the shell emulator](../../../doc/zasm.md):
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Collapse OS
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> sdci
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> fson
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> fopn 0 hello.asm
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> zasm 2 1
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> mptr 8600
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> bsel 1
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> seek 00 0000
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> load ff
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> call 00 0000
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Assembled from a RC2014
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That RC2014 is starting to feel powerful now, right?
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